function ImgShow(evt){
var imgTag=(window.event)?event.srcElement:evt.target;
var imgPath=imgTag.src.replace(/\_\d\./,"_4.");//取得弹出的大图url
var tagTop=Math.max(document.documentElement.scrollTop,document.body.scrollTop);
var tag=document.createElement("div");
tag.style.cssText="width:100%;height:"+Math.max(document.body.clientHeight,document.body.offsetHeight,document.documentElement.clientHeight)+"px;position:absolute;background:black;top:0; z-index:999;filter: Alpha(Opacity=80);Opacity:0.8;";
tag.ondblclick=closes;
var tagImg=document.createElement("div");
tagImg.style.cssText="font:12px /18px verdana;overflow:auto;text-align:center;position:absolute;z-index:999;width:200px;border:0px solid white;background:white;color:white;left:"+(parseInt(document.body.offsetWidth)/2-100)+"px;top:"+(document.documentElement.clientHeight/3+tagTop)+"px;"
tagImg.innerHTML="<div style='padding:10px;background:#cccccc;border:1px solid white'><img src='http://www.veryhuo.com/uploads/common/images/loading.gif' /><br /><br /><b style='color:#999999;font-weight:normal'>Image loading...</b><br /></div>";
tagImg.oncontextmenu=function(){var clsOK=confirm("确定要取消图片显示吗?点击确定将关闭图片。\n如果您是想缩放图片请在图片上双击。"); if(clsOK){closes();};return false};
var closeTag=document.createElement("div");
closeTag.style.cssText="display:none;position:absolute;left:10px;top:10px;color:black;";
var closesHtml="<b style='background:#ccc;border:1px solid white;filter:Alpha(Opacity=50);Opacity:0.5;cursor:pointer;'> X </b>";
closeTag.innerHTML=closesHtml+" 提示:双击图片缩放";
closeTag.onclick=closes;
document.body.appendChild(tag);
document.body.appendChild(tagImg);
var img=new Image();
img.src=imgPath;
img.style.cssText="border:1px solid #cccccc;filter: Alpha(Opacity=0);Opacity:0;cursor:pointer";
var barShow,imgTime;
img.complete?ImgOK():img.onload=ImgOK;
function ImgOK(){
var Stop1=false,Stop2=false,temp=0;
var tx=tagImg.offsetWidth,ty=tagImg.offsetHeight;
var ix=img.width,iy=img.height;
var sx=document.documentElement.clientWidth,sy=window.innerHeight||document.documentElement.clientHeight;
if(iy>sy||ix>sx){
var yy=sy-100;
var xx=(ix/iy)*yy;
}else{
var xx=ix+4;
var yy=iy+3;
}
img.style.width=xx-4+'px';
img.style.height=yy-3+'px';
if(ix<sx&&iy<sy){tagImg.alt="";closeTag.innerHTML=closesHtml;};
var maxTime=setInterval(function(){
temp+=35;
if((tx+temp)<xx){
tagImg.style.width=(tx+temp)+"px";
tagImg.style.left=(sx-(tx+temp))/2+"px";
}else{
Stop1=true;
tagImg.style.width=xx+"px";
tagImg.style.left=(sx-xx)/2+"px";
}
if((ty+temp)<yy){
tagImg.style.height=(ty+temp)+"px";
tagImg.style.top=(tagTop+((sy-(ty+temp))/2))+"px";
}else{
Stop2=true;
tagImg.style.height=yy+"px";
tagImg.style.top=(tagTop+((sy-yy)/2))+"px";
}
if(Stop1&&Stop2){
clearInterval(maxTime);
tagImg.appendChild(img);
temp=0;
imgOPacity();
}
},1);
function imgOPacity(){
temp+=10;

img.style.filter="alpha(opacity="+temp+")";
img.style.opacity=temp/100;
imgTime=setTimeout(imgOPacity,1)
if(temp>100) clearTimeout(imgTime);
}
tagImg.innerHTML="";
tagImg.appendChild(closeTag);
if(ix>xx||iy>yy){
img.alt="左键拖动,双击放大缩小";
img.ondblclick=function (){
if(tagImg.offsetWidth<img.offsetWidth||tagImg.offsetHeight<img.offsetHeight){
img.style.width="auto";
img.style.height="100%";
img.alt="双击可以放大";
img.onmousedown=null;
closeTag.style.top="10px";
closeTag.style.left="10px";
tagImg.style.overflow="visible";
tagImg.style.width=img.offsetWidth+"px";
tagImg.style.left=((sx-img.offsetWidth)/2)+"px";
}else{
img.style.width=ix+"px";
img.style.height=iy+"px";
img.alt="双击可以缩小";
img.onmousedown=dragDown;
tagImg.style.overflow="auto";
tagImg.style.width=(ix<sx-100?ix+20:sx-100)+"px";
tagImg.style.left=((sx-(ix<sx-100?ix+20:sx-100))/2)+"px";
}
}
img.onmousedown=dragDown;
tagImg.onmousemove=barHidden;
tagImg.onmouseout=moveStop;
document.onmouseup=moveStop;
}else{
tagImg.style.overflow="visible";
tagImg.onmousemove=barHidden;
}
}
function dragDown(a){
img.style.cursor="move";
var evts=a||window.event;
var onx=evts.clientX,ony=evts.clientY;
var sox=tagImg.scrollLeft,soy=tagImg.scrollTop;
var sow=img.width+2-tagImg.clientWidth,soh=img.height+2-tagImg.clientHeight;
var xxleft,yytop;
document.onmousemove=function(e){
var evt=e||window.event;
xxleft=sox-(evt.clientX-onx)<0?"0":sox-(evt.clientX-onx)>sow?sow:sox-(evt.clientX-onx);
yytop=soy-(evt.clientY-ony)<0?"0":soy-(evt.clientY-ony)>soh?soh:soy-(evt.clientY-ony);
tagImg.scrollTop=yytop;
tagImg.scrollLeft=xxleft;
closeTag.style.top=(yytop+10)+"px";
closeTag.style.left=(xxleft+10)+"px";
return false;
}
return false;
}
function barHidden(){
clearTimeout(barShow);
closeTag.style.top=(tagImg.scrollTop+10)+"px";
closeTag.style.left=(tagImg.scrollLeft+10)+"px";
if(closeTag.style.display=="none")closeTag.style.display="block";
barShow=setTimeout(function(){closeTag.style.display="none";},1000);
}
function closes(){
document.body.removeChild(tag);
document.body.removeChild(tagImg);
clearTimeout(barShow);
clearTimeout(imgTime);
document.onmouseup=null;
tag=img=tagImg=closeTag=null;
}
function moveStop(){
document.onmousemove=null;
tagImg.onmousemove=barHidden;
img.style.cursor="pointer";
}
}
//事件绑定部分
if(document.getElementById("workDemo")){
var workTag=document.getElementById("workDemo");
var workImg=workTag.getElementsByTagName("img"); //注册此处会把 workDemo下的所有img选中，包括子集下的子集。
var worka=workTag.getElementsByTagName("a");
for(var i=0; i<workImg.length; i++){workImg[i].onclick=ImgShow;worka[i].href="##"}
}
